WO2023037411A1 - Stator pour machine dynamo-électrique et machine dynamo-électrique - Google Patents

Stator pour machine dynamo-électrique et machine dynamo-électrique Download PDF

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Publication number
WO2023037411A1
WO2023037411A1 PCT/JP2021/032859 JP2021032859W WO2023037411A1 WO 2023037411 A1 WO2023037411 A1 WO 2023037411A1 JP 2021032859 W JP2021032859 W JP 2021032859W WO 2023037411 A1 WO2023037411 A1 WO 2023037411A1
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WO
WIPO (PCT)
Prior art keywords
insulating
stator
conductor
electric machine
rectangular wire
Prior art date
Application number
PCT/JP2021/032859
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English (en)
Japanese (ja)
Inventor
陽平 野口
公男 西村
洋三 廣瀬
Original Assignee
日産自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日産自動車株式会社 filed Critical 日産自動車株式会社
Priority to PCT/JP2021/032859 priority Critical patent/WO2023037411A1/fr
Publication of WO2023037411A1 publication Critical patent/WO2023037411A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation

Definitions

  • the present invention relates to a rotating electrical machine stator and rotating electrical machine, and more particularly to a rotating electrical machine stator and rotating electrical machine capable of improving heat dissipation.
  • a U-shaped flat wire coil having an insulating coating is inserted into slots of a stator core in which insulating paper is inserted, and flat wire coils protruding from the slots are inserted into the slots of the stator core.
  • the rectangular wire coil is connected by joining the ends of the wire coil.
  • the insulating resin bobbin as described in Patent Document 1 needs to be inserted into the slot, it requires a certain degree of mechanical strength, and there is a limit to how thin it can be made. Further, when such an insulating resin bobbin is used, a gap is generated between the inner wall of the slot and the insulating resin bobbin, and between the insulating resin bobbin and the coil to be inserted into the insulating resin bobbin. Therefore, there is a problem that it is difficult to further improve the heat dissipation performance of the rotating electric machine stator as described in Patent Document 1 due to the thinness limit of the insulating resin bobbin and the occurrence of these gaps.
  • the present invention has been made in view of such problems of the conventional technology, and an object of the present invention is to provide a stator for a rotating electrical machine and a rotating electrical machine that can improve heat dissipation.
  • the inventors of the present invention have made extensive studies to achieve the above object, and as a result, the above object has been achieved by providing a rectangular wire coil having a conductor having a rectangular wire shape and insulating projections provided on the peripheral surface of the conductor. I found that it can be done, and came to complete the present invention.
  • the stator for a rotating electric machine of the present invention includes a stator core having a slot, a rectangular wire coil disposed through the slot, and a resin material filled in the slot together with the rectangular wire coil.
  • This rectangular wire coil has a conductor having a rectangular wire shape and insulating projections provided on the peripheral surface of the conductor.
  • the rotating electrical machine of the present invention includes a rotating electrical machine stator and a rotating electrical machine rotor.
  • This stator for a rotating electrical machine is the stator for a rotating electrical machine according to the present invention.
  • a stator for a rotating electrical machine and a rotating electrical machine that can improve heat dissipation, since it has a conductor having a rectangular wire shape and a rectangular wire coil having insulating projections installed on the peripheral surface of the conductor.
  • FIG. 1 is a perspective view showing a main part of an embodiment of a rotating electric machine of the present invention
  • FIG. FIG. 2 is a partial cross-sectional view of a slot portion of a stator used in the rotating electrical machine shown in FIG. 1 taken perpendicularly to the axial direction of the stator
  • FIG. 2 is a partial cross-sectional view of a slot portion of a stator used in the rotating electrical machine of FIG. 1 cut along the circumferential direction of the stator
  • 1 is a perspective view showing an example of a conductor having a rectangular wire shape
  • FIG. 5 is a cross-sectional view cut along the axis of the conductor, schematically showing a state in which an adhesive is attached to the conductor shown in FIG. 4;
  • FIG. 5 is a cross-sectional view cut along the axis of the conductor, schematically showing a state in which an adhesive and insulating particles are attached to the conductor of FIG. 4;
  • FIG. FIG. 7 is a front view schematically showing a state in which the rectangular wire-shaped coil shown in FIG. 6 is inserted into slots of a stator core;
  • FIG. 8 is a partial cross-sectional view of a slot portion into which the rectangular wire-shaped coil shown in FIG. 7 is inserted, taken perpendicularly to the axial direction of the stator;
  • FIG. 8 is a front view schematically showing how the end portion side of the flat wire coil of FIG. 7 is bent;
  • FIG. 5 is a cross-sectional view showing a rectangular wire coil used in another embodiment of the rotary electric machine of the present invention
  • FIG. 5 is a cross-sectional view showing a rectangular wire coil used in still another embodiment of the rotating electric machine of the present invention
  • FIG. 8 is a plan view showing a rectangular wire coil used in still another embodiment of the rotating electric machine of the present invention
  • FIG. 8 is a plan view showing a rectangular wire coil used in still another embodiment of the rotating electric machine of the present invention
  • a stator for a rotating electrical machine and a rotating electrical machine according to the present invention will be described in detail below with reference to the drawings. Note that the dimensional ratios in the drawings quoted below are exaggerated for convenience of explanation, and may differ from the actual ratios.
  • the rotating electrical machine 60 of this embodiment includes a rotating electrical machine stator 40 and a rotating electrical machine rotor 50 .
  • the rotating electric machine stator 40 of the present embodiment has slots 20A that are drilled in a direction parallel to the axis and extend radially in a cross section perpendicular to the axis. It has a stator core 20, a flat wire coil 10 penetrating through the slot 20A, and a resin material 30 filled in the slot 20A together with the flat wire coil 10.
  • FIG. 1 the rotating electrical machine stator 40 of the present embodiment has slots 20A that are drilled in a direction parallel to the axis and extend radially in a cross section perpendicular to the axis. It has a stator core 20, a flat wire coil 10 penetrating through the slot 20A, and a resin material 30 filled in the slot 20A together with the flat wire coil 10.
  • the rectangular wire coil 10 protruding from the slot 20A of the stator core 20 is cast in the resin material 30.
  • flat wire coils projecting from a plurality of slots of a stator core are actually connected. Assembled.
  • the rectangular wire coil 10 used in this embodiment has a conductor 15 having a rectangular wire shape and an insulating projection 16 provided on the peripheral surface 15A of the conductor 15.
  • the insulating protrusion 16 has a structure in which an insulating material 161 is fixed to the peripheral surface 15A of the conductor 15 with an adhesive 169.
  • the insulating material 161 constitutes insulating particles 163 having a spherical shape.
  • the insulating protrusions 16 exhibit a protective function, an electrical insulation function, and a resin filling promotion function.
  • the protection function is that when the conductor 15 is inserted into the slot 20A, the insulating projection 16 contacts the inner wall of the slot 20A before the conductor 15, so that the conductor 15 contacts the inner wall of the slot 20A and the conductor 15 It means the function to suppress or prevent the occurrence of scratches on the surface.
  • the electrical insulation function means the function of ensuring or improving the electrical insulation between the conductor 15 and the inner wall of the slot 20A by the insulating projection 16.
  • the electrical insulation between the conductor 15 and the inner wall of the slot 20A may be ensured only by the insulating projection 16, but the electrical insulation may be ensured by the insulating projection 16 and the resin material 30 described above.
  • the resin material 30 can also improve the insulating properties, the insulating projections 16 can be formed more simply than the insulating coating that is previously formed on the rectangular wire-shaped conductor.
  • the function of promoting resin filling means that the insulating projection 16 forms a gap between the conductor 15 and the inner wall of the slot 20A, and facilitates filling of the resin material 30 into this gap.
  • the resin material 30 described above forms a heat transfer path in this gap and contributes to electrical insulation between the conductor 15 and the inner wall of the slot 20A.
  • the dimension between the conductor 15 and the inner wall of the slot 20A can be narrowed within a range in which the resin material 30 can be filled.
  • the rotating electrical machine stator 40 of the present embodiment since the conductor 15 having a rectangular wire shape and the rectangular wire coil having the insulating protrusions 16 provided on the peripheral surface 15A of the conductor are provided, the protection function and the electrical insulation function described above are provided. Also, the function of promoting resin filling is exhibited, and the heat dissipation can be improved. In addition, since there is no need to use an insulating resin bobbin, which has a limit in thinning, the space factor of the conductor in the slot can be increased. Furthermore, since the resin material 30 can ensure or compensate for the electrical insulation function, there is no need to use an expensive rectangular wire coil with an insulating coating formed in advance, and the cost can be reduced.
  • the rotary electric machine 60 of the present embodiment includes the stator 40 for a rotary electric machine, it is possible to increase the space factor of the conductors in the slots. Therefore, even if the motor size is the same, the output performance of the motor is improved. are doing.
  • the insulating protrusion 16 has a structure in which the insulating material 161 (insulating particles 163) is fixed to the peripheral surface 15A of the conductor 15 by the adhesive 169, the gap filled with the resin becomes uniform and stable to some extent, and the above-described The protective function, electrical insulation function, and resin filling promotion function thus obtained are exhibited more stably and effectively.
  • the insulating particles 163 preferably have a particle size of 5 ⁇ m or more, more preferably 10 ⁇ m or more.
  • the insulating particles 163 preferably have a particle size of 200 ⁇ m or less, more preferably 150 ⁇ m or less, and even more preferably 100 ⁇ m or less. From the viewpoint of being able to cope with even higher voltage motors, it is preferable to set the particle size to 10 ⁇ m or more and 100 ⁇ m or less.
  • the particle sizes are uniform.
  • the particle size of the insulating particles and the fiber diameter of the insulating fibers to be described later are obtained by observing the insulating particles, insulating fibers, etc. in a cross section of the insulating protrusion cut along the height direction with a scanning electron microscope (SEM) or the like. It is defined as the maximum distance between any two points on the contour line of insulating particles or insulating fibers.
  • the shape of the insulating particles 163 is spherical, polyhedral, or three-dimensional star-shaped rather than cubic, plate-shaped, scale-shaped, or needle-shaped.
  • a typical example of the three-dimensional star shape is a shape obtained by forming a plurality of protrusions on the surface of a spherical particle, that is, a so-called confetti shape.
  • the insulating particles 163 have a shape suitable for sieving, and the particle size can be easily adjusted, so that they are easy to handle. Furthermore, the insulating particles 163 having a spherical shape or a confetti shape are less likely to damage the inner wall of the slot 20A. Moreover, the insulating particles 163 having a polyhedral shape or a confetti shape with projections on the surface are preferable because the gaps between the particles can be easily increased. Furthermore, since the particle size can be made uniform in the upstream process of the production process, it is easy to form a gap of a fixed size around the conductor 15, which is easy to fill with resin. It is easy to improve the quality of the stator and rotating electric machine.
  • the ratio of the actual surface area of the flat wire coil 10 to the apparent surface area of the flat wire coil 10 is preferably 1.1 or more and 3.0 or less, and more preferably 1.1 or more and 2.0 or less. It is more preferable to have By setting this ratio to 1.1 or more and 3.0 or less, it is possible to form a gap that facilitates resin filling, and the protective function, electrical insulation function, and resin filling promotion function described above can be exhibited more effectively.
  • the apparent surface area of the flat wire coil is defined as the area of the circumscribed surface of the flat wire coil that is measured only in consideration of the insulating protrusions 16 and without considering the holes and grooves existing between the insulating protrusions 16. do. Such an apparent surface area can be calculated, for example, by actual measurement using a scanning electron microscope (SEM) photograph.
  • SEM scanning electron microscope
  • the actual surface area of the flat wire coil is defined as the actual surface area of the flat wire coil measured in consideration of not only the insulating protrusions 16 but also the holes and grooves existing between the insulating protrusions 16 .
  • Such an actual surface area can be calculated by, for example, a mercury intrusion method or actual measurement using a scanning electron microscope (SEM) photograph.
  • the height h of the insulating protrusion 16 is preferably 5 ⁇ m or more, more preferably 10 ⁇ m or more. Also, the height h of the insulating protrusion 16 is preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, and even more preferably 100 ⁇ m or less. From the viewpoint that the gaps that are easily filled with resin can be made thin, and the above-described protective function, electrical insulation function, and resin filling promotion function can be more effectively exhibited, the height h of the insulating protrusions 16 is set to 10 ⁇ m or more and 100 ⁇ m or less. It is preferable to
  • the height h of the insulating protrusion 16 is defined as the distance from the part in contact with the conductor 15 to the farthest protrusion.
  • a portion in contact with the conductor 15 is made of an adhesive 169 or an insulating material 161 .
  • the ratio of the projected area of the insulating protrusions 16 to the apparent surface area of the flat wire coil 10 is preferably 1% by area or more, more preferably 5% by area or more, and more preferably 10% by area or more. More preferred. Also, this ratio is preferably 90 area % or less, more preferably 80 area % or less, and even more preferably 70 area % or less.
  • the insulating projections 16 are formed of insulating particles or insulating fibers, by setting this ratio to 1 area % or more and 70 area % or less, the peripheral surface 15A of the conductor 15 is physically protected from damage and the like. A gap that is easily filled with resin can be formed, and the protective function, electrical insulation function, and resin filling promotion function described above can be exhibited more effectively.
  • a conductor 15 having a rectangular wire shape as shown in FIG. 4 is formed into a U shape by a bending device using a mold.
  • an adhesive 169 is applied to the straight portion of the conductor 15 as shown in FIG. 5 by brush or spray.
  • insulating particles 163 are formed with adhesive 169 as shown in FIG. It is fixed to the peripheral surface 15A of the conductor 15, and the insulating projection 16 is formed on the peripheral surface 15A of the rectangular wire-shaped conductor 15. As shown in FIG. In this manner, the rectangular wire coil 10 used in the rotating electric machine stator of the present embodiment is obtained.
  • the rectangular wire coil 10 thus obtained is inserted into slots (not shown) of the stator core 20 .
  • slots not shown
  • only a portion (four) of the rectangular wire coils 10 is shown.
  • gaps are formed between the conductors 15 and between the conductors 15 and the inner wall of the slot 20A by insulating projections 16 provided on the peripheral surface 15A. can do.
  • the base of the rectangular wire-shaped coil 10 is restrained by a holding jig 201, the tip of the rectangular wire-shaped coil 10 is brought into contact with a bending jig 203, and the projecting portions of the plurality of flat wire-shaped coils 10 are shown by arrows. Bend as indicated by Z. Furthermore, although not shown, this bending causes the ends of the flat wire coils to come into contact with each other, and the flat wire coils 10 are connected by welding them together.
  • the resin material 30 is filled in the slots 20A and the rectangular wire coils 10 projecting from the slots 20A of the stator core 20 are cast with the resin material 30. 1 to 3 is obtained.
  • insulating particles are added to the adhesive raw material in advance and dispersed uniformly, and after coating the conductor with the insulating particles, the adhesive on the surface side is dissolved.
  • the insulating particles may protrude from the adhesive.
  • the insulating particles can be evenly arranged on the peripheral surface of the conductor, so that the above-described protecting function, electrical insulating function, and resin filling promoting function can be exhibited more effectively.
  • the rectangular wire-shaped coil obtained by such a manufacturing method is easier to widen the gap and has a better resin filling property than the rectangular wire-shaped coil obtained by the above-described manufacturing method.
  • the rectangular wire coil 11 used in the rotary electric machine of the present embodiment is similar to the rectangular wire coil shown in FIGS. has the same structure as
  • the insulating material 161 is the insulating particles 163 having a confetti shape. It is possible to form a gap that is easy to fill with resin, and the protective function, electrical insulation function, and resin filling promotion function described above can be exhibited more effectively.
  • the insulating projections 16 have a structure in which insulating particles 163 are fixed to the peripheral surface 15A of the conductor 15 with an adhesive 169 .
  • the insulating protrusion 16 has a structure in which a part of the insulating particles 163 is embedded in a layer made of the adhesive 169 .
  • the ratio of the embedding depths d2 and d3 of the insulating particles 163 to the particle diameter d1 of the insulating particles 163 is 1/4 or more and 3/4 or less.
  • the rectangular wire coil 12 used in the rotating electric machine of this embodiment has the insulating particles 163 embedded in the above-described predetermined amount.
  • the gap becomes stable, and it is possible to form a gap that is less likely to cause resin filling defects and is easy to be filled with resin.
  • the protective function, electrical insulation function, and resin filling promotion function described above are exhibited more effectively.
  • the gap is formed to facilitate resin filling, the filling pressure during resin filling can be stabilized at a low level, and the quality of resin filling can be improved.
  • the insulating protrusions 16 are formed of insulating fibers 165 that are spirally wound around the peripheral surface 15A of the conductor 15. It has the same structure as the rectangular wire coil shown in FIGS.
  • the insulating fiber 165 may be mechanically wound around the conductor 15 and fixed, or may be fixed with an adhesive (not shown).
  • the insulating fiber 165 is mechanically wound around the conductor 15. Therefore, by adjusting the pitch of the spiral during winding, it is easy to form a gap of a certain size. In addition, by adjusting the pitch of the spiral during winding, the actual surface area and the projected area of the insulating protrusions can be easily adjusted, making it easy to form appropriate gaps between the insulating fibers 165 . As a result, in addition to the advantages of the first embodiment, the resin flow resistance of the resin material can be reduced, and not only the above-described protection function, electrical insulation function, and resin filling promotion function can be exhibited more effectively, Production efficiency is superior to that of the embodiment.
  • the insulating fiber 165 in addition to ordinary fibers, fibers formed from woven fabric, non-woven fabric, and knitted fabric can be used. Furthermore, the insulating fiber 165 preferably has a fiber diameter of 5 ⁇ m or more, more preferably 10 ⁇ m or more. Also, the fiber diameter is preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, and even more preferably 100 ⁇ m or less. The fiber diameter is preferably 10 ⁇ m or more and 100 ⁇ m or less from the viewpoint of being able to cope with even higher voltages of motors.
  • the insulating protrusions 16 are formed of an insulating fiber aggregate 167 provided on the peripheral surface 15A of the conductor 15. , has the same structure as the rectangular wire coil shown in FIGS.
  • the insulating fiber assembly 167 is made of woven fabric.
  • the insulating fiber assembly 167 may be mechanically wound around the conductor 15 and fixed, or may be fixed with an adhesive (not shown).
  • the conductor 15 is covered with the insulating fiber assembly 167, and there is no insulating protrusion due to insulating particles that are difficult to align in height on the surface thereof.
  • it is possible to suppress interference such as catching when inserting the flat wire coil into the slot, and improve the insertability.
  • production equipment and storage equipment can be simplified.
  • the insulating fiber assembly 167 an insulating fiber assembly made of woven fabric, non-woven fabric, or knitted fabric can be mentioned. Furthermore, the insulating fiber assembly 167 preferably has a thickness of 5 ⁇ m or more, more preferably 10 ⁇ m or more. Also, the thickness is preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less, and even more preferably 100 ⁇ m or less. The thickness is preferably 10 ⁇ m or more and 100 ⁇ m or less from the viewpoint of being able to cope with even higher voltage motors.
  • thermosetting resins such as epoxy resins and unsaturated polyester resins. These resins are sufficient as long as they have ordinary insulating properties, but if it is desired to achieve excellent insulating properties between the coil and the stator core, resins with excellent insulating properties may be used.
  • Examples of materials for the insulating material 161 include ceramic, glass, resin, and cellulose (paper). Ceramics and glass are preferable to resins and papers from the viewpoint of placing importance on wear resistance and hardness in the slot. Ceramic is preferable to glass from the viewpoint of being less likely to break. From the viewpoint of facilitating the insertion of the flat wire coil into the slot, an insulating material having a small coefficient of friction is preferable. Examples of such an insulating material include an insulating material having self-lubricating properties and an insulating material having a small surface roughness.
  • the adhesive 169 for example, it is preferable that the insulating material can be fixed to the conductor while withstanding the heat resistance temperature of about 180° C. to 250° C. of the motor. .
  • the adhesive preferably has flexibility from the viewpoint of conformability.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

Ce stator pour stator de machine dynamo-électrique comprend un noyau de stator ayant des fentes, une bobine de fil plat disposée à travers les fentes, et un élément de résine disposé dans les fentes conjointement avec la bobine de fil plat. La bobine de fil plat a un conducteur qui a une forme de fil plat, et des parties saillantes isolantes disposées sur la surface circonférentielle du conducteur.
PCT/JP2021/032859 2021-09-07 2021-09-07 Stator pour machine dynamo-électrique et machine dynamo-électrique WO2023037411A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/032859 WO2023037411A1 (fr) 2021-09-07 2021-09-07 Stator pour machine dynamo-électrique et machine dynamo-électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/032859 WO2023037411A1 (fr) 2021-09-07 2021-09-07 Stator pour machine dynamo-électrique et machine dynamo-électrique

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WO2023037411A1 true WO2023037411A1 (fr) 2023-03-16

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5036014B1 (fr) * 1970-12-26 1975-11-20
JPS57170412A (en) * 1981-04-14 1982-10-20 Showa Electric Wire & Cable Co Method of producing insulated wire
JP2008288106A (ja) * 2007-05-18 2008-11-27 Furukawa Electric Co Ltd:The 絶縁電線
JP2015005651A (ja) * 2013-06-21 2015-01-08 Ｎｅｃトーキン株式会社 コイル及びリアクトル
JP2015180180A (ja) * 2014-02-28 2015-10-08 日東シンコー株式会社 回転電機用絶縁シート及び絶縁シート製造方法
JP2021114819A (ja) * 2020-01-16 2021-08-05 株式会社デンソー 電機子

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5036014B1 (fr) * 1970-12-26 1975-11-20
JPS57170412A (en) * 1981-04-14 1982-10-20 Showa Electric Wire & Cable Co Method of producing insulated wire
JP2008288106A (ja) * 2007-05-18 2008-11-27 Furukawa Electric Co Ltd:The 絶縁電線
JP2015005651A (ja) * 2013-06-21 2015-01-08 Ｎｅｃトーキン株式会社 コイル及びリアクトル
JP2015180180A (ja) * 2014-02-28 2015-10-08 日東シンコー株式会社 回転電機用絶縁シート及び絶縁シート製造方法
JP2021114819A (ja) * 2020-01-16 2021-08-05 株式会社デンソー 電機子

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